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&lt;script src="https://unpkg.com/react@16/umd/react.development.js">&lt;/script>
&lt;script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js">&lt;/script>
          
&lt;div id='app'>&lt;/div>
    </pre>
    <pre data-lang="css">
.foo {
  background: green;
}
    </pre>
    <pre data-lang="typescript">
ReactDOM.render(
  &lt;div>Hello World&lt;/div>, 
  document.getElementById('app')
);
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